Electric Interactions in Chemistry
Observations of two spheres suspended from the terminals of a high voltage generator remind us of the principles that opposite charges attract, like charges repel, and uncharged bodies have no electric interaction. To determine quantitatively the effect of distance on electric force, a sensitive balance measures the force between two charged spheres. The distance is varied and the electric force is calculated from changes in balance readings. A graph of electric force against distance suggests the equation Fr^2 = k (a constant), and the tabulated data confirm this relation. To illustrate the applications in chemistry of these principles, the migration of positive and negative ions and their mutual precipitation are shown in time-lapse photography and in animation.
Producer CHEM Study, College of Chemistry, U.C. BerkeleyAudio/Visual sound, color
Collaborators: Prof. J. Leland Hollenberg, University of Redlands, Redlands, California, and Prof. J. Arthur Campbell, Harvey Mudd College, Claremont, California.
March 6, 2016
Very good but...
Unfortunately the film is so faded, the colors of the solutions really look nothing like they do in real life! The copper sulfate is a bright blue, and it looks brown in the pictures. The potassium chromate is a bright yellow, and appears to be a dull green. The logic is correct in their descriptions, but the colors bear no resemblance to what they're saying.